Server will not connect to itunes, app store, google drive, etc.

MacBook Pro, mid 2012, running Yosemite. I posted here because these problems started after upgrading to Yosemite, so maybe it's specific to that, not sure.
I seem to have a few interlinked problems. I solved a problem with kernel_task taking over 100% CPU usage and preventing an internet connection by getting rid of my Norton/Symantec security suite as well as TunnelBear. However, there seems to be a residual problem, as nothing seems to be connecting to the server.
I can surf the Internet no problem; it's things like iTunes (which crashes every time I try to open it), the App Store (which is a grey slate saying "cannot connect to app store"), and Google Drive (which doesn't sync) that are having connection issues.
I actually first noticed this problem after downloading Pacifist to extract the 'coreaudiod' launch daemon (which got destroyed in one of my previous fixes, long story), but it won't work until I can connect to the App Store and get a Mac OS X installer.
I am self-teaching as I go here, so I don't know much about this (and don't have any Mac tech support where I am unfortunately) and could use the help.
Here's what EtreCheck has to say, fwiw:
EtreCheck version: 2.0.6 (91)
Report generated 6 November 2014 18:31:35 GMT-3
Hardware Information: ℹ️
  MacBook Pro Intel Core i5, Intel Core i7, 13" (Mid 2012)
  MacBook Pro - model: MacBookPro9,1
  1 2.6 GHz Intel Core i7 CPU: 4-core
  8 GB RAM Upgradeable
  BANK 0/DIMM0
  4 GB DDR3 1600 MHz ok
  BANK 1/DIMM0
  4 GB DDR3 1600 MHz ok
  Bluetooth: Good - Handoff/Airdrop2 supported
  Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
  Intel HD Graphics 4000 -
  Color LCD 1440 x 900
  NVIDIA GeForce GT 650M - VRAM: 1024 MB
System Software: ℹ️
  OS X 10.10 (14A389) - Uptime: 2:46:7
Disk Information: ℹ️
  APPLE HDD HTS547575A9E384 disk0 : (750.16 GB)
  S.M.A.R.T. Status: Verified
  EFI (disk0s1) <not mounted> : 210 MB
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
  Macintosh HD (disk1) /  [Startup]: 748.93 GB (511.05 GB free)
  Encrypted AES-XTS Unlocked
  Core Storage: disk0s2 749.30 GB Online
  MATSHITADVD-R   UJ-8A8 
USB Information: ℹ️
  Apple Inc. FaceTime HD Camera (Built-in)
  Apple Inc. Apple Internal Keyboard / Trackpad
  Apple Inc. BRCM20702 Hub
  Apple Inc. Bluetooth USB Host Controller
  Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
  Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
  Mac App Store and identified developers
Kernel Extensions: ℹ️
  /System/Library/Extensions
  [not loaded] com.seagate.driver.PowSecDriverCore (5.2.3 - SDK 10.4) Support
  /System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
  [not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.2.3 - SDK 10.4) Support
  [not loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.2.3 - SDK 10.5) Support
  [not loaded] com.seagate.driver.SeagateDriveIcons (5.2.3 - SDK 10.4) Support
Launch Agents: ℹ️
  [not loaded] com.adobe.AAM.Updater-1.0.plist Support
  [loaded] com.google.keystone.agent.plist Support
  [running] com.pharos.notify.plist Support
  [running] com.pharos.popup.plist Support
Launch Daemons: ℹ️
  [failed] com.adobe.fpsaud.plist Support
  [loaded] com.google.keystone.daemon.plist Support
  [loaded] com.microsoft.office.licensing.helper.plist Support
  [loaded] com.tunnelbear.mac.tbeard.plist Support
User Launch Agents: ℹ️
  [loaded] com.adobe.AAM.Updater-1.0.plist Support
  [loaded] com.adobe.ARM.[...].plist Support
User Login Items: ℹ️
  iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
  Google Drive Application (/Applications/Google Drive.app)
Internet Plug-ins: ℹ️
  JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
  o1dbrowserplugin: Version: 5.38.5.0 - SDK 10.8 Support
  Unity Web Player: Version: UnityPlayer version 4.5.2f1 - SDK 10.6 Support
  Default Browser: Version: 600 - SDK 10.10
  Flip4Mac WMV Plugin: Version: 2.4.4.2 Support
  AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
  FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
  Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
  Flash Player: Version: 15.0.0.152 - SDK 10.6 Cannot contact Adobe
  QuickTime Plugin: Version: 7.7.3
  googletalkbrowserplugin: Version: 5.38.5.0 - SDK 10.8 Support
  SharePointBrowserPlugin: Version: 14.4.1 - SDK 10.6 Support
  AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
  DirectorShockwave: Version: 12.1.1r151 - SDK 10.6 Support
Safari Extensions: ℹ️
  Norton Internet Security (Disabled)
  Searchme
3rd Party Preference Panes: ℹ️
  Flash Player  Support
  Flip4Mac WMV  Support
  Paragon NTFS for Mac ® OS X  Support
Time Machine: ℹ️
  Time Machine not configured!
Top Processes by CPU: ℹ️
      5% Google Chrome
      4% AppleIDAuthAgent
      3% WindowServer
      0% Google Drive
      0% GoogleTalkPlugin
Top Processes by Memory: ℹ️
  344 MB Google Chrome
  153 MB Google Chrome Helper
  137 MB Finder
  137 MB Google Drive
  129 MB WindowServer
Virtual Memory Information: ℹ️
  750 MB Free RAM
  3.97 GB Active RAM
  2.80 GB Inactive RAM
  1.06 GB Wired RAM
  4.34 GB Page-ins
  135 KB Page-outs

If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you use FileVault 2, then before running the Installer you must launch Disk Utility and select the icon of the FileVault startup volume ("Macintosh HD," unless you gave it a different name.) It will be nested below another icon with the same name. Click the Unlock button in the toolbar and enter your login password when prompted. Then quit Disk Utility to be returned to the main Recovery screen.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.

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